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Share-based Compensation and Other Employment Benefit Plans (Restricted Stock Units Activity) (Details) - $ / shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restricted Share Units      
Quantity      
Outstanding, Beginning of Period (in shares) 817,000 526,000 566,000
Granted (in shares) 763,000 550,000 249,000
Assumed in acquisition (in shares)   136,000  
Dividend equivalents granted (in shares) 59,000 23,000 7,000
Quantity change by TSR factor (in shares) 0 0 0
Vested (in shares) (384,000) (304,000) (280,000)
Adjustment for performance vs. target (in shares) 0 0 0
Forfeited (in shares) (34,000) (114,000) (16,000)
Outstanding, End of Period (in shares) 1,221,000 817,000 526,000
Weighted-Average Grant Date Fair Value      
Outstanding, Beginning of Period, Weighted-Average Grant-date Fair Value (in dollars per share) $ 38.32 $ 41.18 $ 33.25
Granted, Weighted-Average Grant-date Fair Value (in dollars per share) 32.42 36.27 47.34
Assumed in acquisition (in dollars per share)   31.99  
Dividend equivalents granted, Weighted-Average Grant-date Fair Value (in dollars per share) 32.42 36.27 44.10
Quantity change by TSR factor (in dollars per share) 0 0 0
Vested, Weighted-Average Grant-date Fair Value (in dollars per share) 38.04 37.04 30.86
Adjustment for performance vs. target (in dollars per share) 0 0 0
Forfeited, Weighted-Average Grant-date Fair Value (in dollars per share) 35.97 37.04 38.60
Outstanding, End of Period, Weighted-Average Grant-date Fair Value (in dollars per share) $ 34.50 $ 38.32 $ 41.18
Market Restricted Share Units      
Quantity      
Outstanding, Beginning of Period (in shares) 216,000 144,000 171,000
Granted (in shares) 0 163,000 58,000
Assumed in acquisition (in shares)   0  
Dividend equivalents granted (in shares) 9,000 6,000 3,000
Quantity change by TSR factor (in shares) 7,000 (19,000) 18,000
Vested (in shares) (104,000) (59,000) (105,000)
Adjustment for performance vs. target (in shares) 0 0 0
Forfeited (in shares) (37,000) (19,000) (1,000)
Outstanding, End of Period (in shares) 91,000 216,000 144,000
Weighted-Average Grant Date Fair Value      
Outstanding, Beginning of Period, Weighted-Average Grant-date Fair Value (in dollars per share) $ 39.99 $ 41.91 $ 35.24
Granted, Weighted-Average Grant-date Fair Value (in dollars per share) 0 37.20 48.46
Assumed in acquisition (in dollars per share)   0  
Dividend equivalents granted, Weighted-Average Grant-date Fair Value (in dollars per share) 39.99 37.20 41.91
Quantity change by TSR factor (in dollars per share) 41.00 37.99 33.21
Vested, Weighted-Average Grant-date Fair Value (in dollars per share) 41.00 37.99 33.21
Adjustment for performance vs. target (in dollars per share) 0 0 0
Forfeited, Weighted-Average Grant-date Fair Value (in dollars per share) 38.42 37.99 38.32
Outstanding, End of Period, Weighted-Average Grant-date Fair Value (in dollars per share) $ 39.54 $ 39.99 $ 41.91
Performance Share Units      
Quantity      
Outstanding, Beginning of Period (in shares) 279,000 248,000 245,000
Granted (in shares) 131,000 140,000 86,000
Assumed in acquisition (in shares)   0  
Dividend equivalents granted (in shares) 23,000 9,000 4,000
Quantity change by TSR factor (in shares) 0 0 0
Vested (in shares) (110,000) (93,000) (84,000)
Adjustment for performance vs. target (in shares) 34,000 6,000 (1,000)
Forfeited (in shares) (9,000) (31,000) (2,000)
Outstanding, End of Period (in shares) 348,000 279,000 248,000
Weighted-Average Grant Date Fair Value      
Outstanding, Beginning of Period, Weighted-Average Grant-date Fair Value (in dollars per share) $ 41.52 $ 38.29 $ 31.54
Granted, Weighted-Average Grant-date Fair Value (in dollars per share) 35.75 37.34 47.23
Assumed in acquisition (in dollars per share)   0  
Dividend equivalents granted, Weighted-Average Grant-date Fair Value (in dollars per share) 41.52 37.34 28.06
Quantity change by TSR factor (in dollars per share) 0 0 0
Vested, Weighted-Average Grant-date Fair Value (in dollars per share) 41.61 26.35 28.06
Adjustment for performance vs. target (in dollars per share) 41.61 37.34 28.06
Forfeited, Weighted-Average Grant-date Fair Value (in dollars per share) 41.52 40.34 33.52
Outstanding, End of Period, Weighted-Average Grant-date Fair Value (in dollars per share) $ 39.33 $ 41.52 $ 38.29